Patent GB-209849-A (GB)
Title: Improvements in the treatment of cellulose esters for dyeing
IPC: D06P5/20
Filed: 1922-10-21
Abstract: The alkaline saponification of cellulose esters, such as cellulose acetate, prior to or during dyeing, is effected in the presence of soluble aldehydes or oxyaldehydes or substances containing them loosely combined, or of aromatic sulphonic or carboxylic acids or their salts, or mixtures of the above-described aldehydes and acids. Examples are given of the treatment of acetate silk with baryta water and formaldehyde or acetaldehyde, strontia water and glucose, caustic soda lye and formaldehyde, glyoxal sulphate, sodium glyoxylate, sodium formaldehyde bisulphate, sodium acetaldehyde bisulphite, or sodium formaldehyde sulphoxylate, lime water and the calcium salt of the condensation product of naphthalene-b -sulphonic acid and formaldehyde described in Specification 7137/13, caustic soda lye and the condensation product of cresol sulphonic acid and formaldehyde described in Specification 8511/12, [Class 2 (iii), Dyes &c.]; the calcium salts of anthracene sulphonic acid, naphthalene-b -sulphonic acid, or lignine sulphonic acid, or the sodium salts of 2-naphthol-3:6-disulphonic acid, m- or p-cresol sulphonic acid, b -naphthoic acid, 2 : 3-oxynaphthoic acid, or p-oxybenzoic acid, may also be used.  Specification 1970/12, [Class 2 (iii), Dyes &c.], also is referred to.ALSO:The alkaline saponification of cellulose esters, such as cellulose acetate, prior to or during dyeing, is effected in the presence of soluble aldehydes or oxyaldehydes or substances containing them loosely-combined, or of aromatic sulphonic or carboxylic acids or their salts, or mixtures of the above-described aldehydes and acids.  According to the proportions of their auxiliary agents used, the process can be carried out so as to give hot fibre either increased or diminished affinity for dyestuffs, the latter effect is of value in dyeing mixed goods. According to examples:-acetate silk is treated with baryta water and formaldehyde and then dyed with the yellow vat dye described in Specification 1970/12, [Class 2 (iii), Dyes &c.]; acetate silk is treated with baryta water and acetaldehyde and then dyed with Indanthrene blue GCD; acetate silk is treated with strontia water and glucose and then dyed with Indanthrene blue GCD; acetate silk is treated with caustic soda lye and formaldehyde and subsequently or simultaneously dyed with Pyramine yellow G; acetate silk is treated with caustic soda lye and glyoxal sulphate and then dyed with Oxamine green G; acetate silk is treated with caustic soda lye and sodium glyoxylate and then dyed with Oxamine brown R; acetate silk is treated with caustic soda lye and sodium formaldehyde bisulphite and then dyed with Cotton fast red 4BS; acetate silk is treated with caustic soda lye and sodium acetaldehyde bisulphite and then dyed with Indoine blue BB and alum; acetate silk is treated with caustic soda lye and sodium formaldehyde sulphoxylate and then dyed with Oxamine blue 3B; acetate silk is treated with lime water and the calcium salt of the condensation product of naphthalene-b -sulphonic acid and formaldehyde described in Specification 7137/13, [Class 2 (iii), Dyes &c.], and then dyed with Oxamine blue 3B; acetate silk is treated with caustic soda lye and the calcium salt of the condensation product of cresol sulphonic acid and formaldehyde described in Specification 8511/12, [Class 2 (iii), Dyes &c.], and then dyed with Pyramine yellow G; the calcium salts of anthracene sulphonic acid, naphthalene-5-sulphonic acid, or lignine sulphonic acid, or the sodium salts of 2-naphthol-3 : 6-disulphonic acid, p-cresol sulphonic acid,b -naphthoic acid, 2 : 3-oxynaphthoic acid, or p-oxybenzoic acid, may also be used: a mixed fabric of cotton and acetate silk is dyed with Kryogene black TBO in a sodium sulphate bath containing the sodium salts of p- and m-cresol sulphonic acids, the cotton being dyed and the acetate silk remaining undyed; other sulphur dyes, such as Kryogene direct blue G, or vat dyes such as Indanthrene yellow G, may be employed similarly.